Derivatives and Hedging Activities - Additional Information (Detail) £ in Millions	3 Months Ended
	Oct. 31, 2019 USD ($)	Jul. 31, 2019 USD ($)	Oct. 31, 2018 USD ($)	Oct. 31, 2019 GBP (£)
Summary
Derivative maturity	18 months
Derivative, Notional Amount	$ 22,925,000	$ 29,389,000
Summary of Cash Flow Hedge Activity
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	(620)	(805)
Cash Flow Hedge Gain (Loss) Reclassified from OCI to Earnings	(381,000)		$ (47,000)
Summary of Derivative Instruments Not Designated as Hedging Instruments
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	(8,000)		$ 33,000
Senior Unsecured Notes [Member]
Summary of Net Investment Hedge Activity
Net investment hedges to hedge portions of net investment | £				£ 45
Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives Assets	595,000	474,000
Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivatives Liabilities	12,000	5,000
Long-term Debt [Member]
Derivatives, Fair Value [Line Items]
Derivatives Liabilities	50,166,000	50,189,000
Designated as hedging instruments [Member]
Summary
Derivative, Notional Amount	19,540,000	26,013,000
Not designated as hedging Instruments [Member
Summary
Derivative, Notional Amount	3,385,000	3,376,000
Unrealized gain on cash flow hedges | Designated as hedging instruments [Member] | Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives Assets	591,000	472,000
Unrealized gain on cash flow hedges | Designated as hedging instruments [Member] | Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivatives Liabilities	0	0
Unrealized gain on cash flow hedges | Designated as hedging instruments [Member] | Long-term Debt [Member]
Derivatives, Fair Value [Line Items]
Derivatives Liabilities	0	0
Unrealized gain on cash flow hedges | Not designated as hedging Instruments [Member | Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives Assets	4,000	2,000
Unrealized gain on cash flow hedges | Not designated as hedging Instruments [Member | Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivatives Liabilities	12,000	5,000
Unrealized gain on cash flow hedges | Not designated as hedging Instruments [Member | Long-term Debt [Member]
Derivatives, Fair Value [Line Items]
Derivatives Liabilities	0	0
Net Investment Hedging [Member] | Designated as hedging instruments [Member] | Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives Assets	0	0
Net Investment Hedging [Member] | Designated as hedging instruments [Member] | Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivatives Liabilities	0	0
Net Investment Hedging [Member] | Designated as hedging instruments [Member] | Long-term Debt [Member]
Derivatives, Fair Value [Line Items]
Derivatives Liabilities	$ 50,166,000	$ 50,189,000